High-temperature-resistant electrical capacitance tomography sensor

Abstract

The invention discloses a high-temperature-resistant electrical capacitance tomography sensor applicable to room temperature to a 600 DEG C high-temperature environment. The sensor comprises an array distribution electrode, a shaft end shielding electrode, an electric-insulation isolating layer, a shaft end shielding electrode connecting layer, a fixing layer, a shielding cover and a signal transmission line, wherein the array distribution electrode is made by an etching hollowing technique, and composed of a measuring end and a fixing end which are respectively used for measuring the capacitance and wrapping and fixing the electrode measuring end and transmission cable; the measuring end is attached to the outer wall of a high-temperature-resistant electric-insulation pipeline through a high-temperature-resistant electric-insulation rubber overall locating sleeve; the signal transmission line comprises a hot temperature section and a normal temperature section which are respectively a double-shelding line composed of a cable core, an electric-insulation layer and a shielding silk net; and the shaft end shielding electrode connecting layer directly contacts the shaft end shielding electrode, and is connected with the shielding cover. The sensor can be normally used at room temperature to a 600-DEG C high-temperature environment, thereby effectively widening the application range of the electrical capacitance tomography technique in the field of high-temperature thermal state.

Description

technical field [0001] The invention belongs to the field of sensor design, and in particular relates to a capacitance tomography sensor applied in a high-temperature environment ranging from room temperature to 600°C. Background technique [0002] Electric capacitance tomography (ECT) is a kind of process tomography technology. Its basic principle is that multi-phase media have different dielectric constants. By arranging multi-electrode array capacitive sensors outside the measured object, when the measuring electrodes When the concentration of the medium in the cross-section changes, it will cause a change in the equivalent dielectric constant, resulting in a change in the capacitance value between the electrode pairs measured by the sensor. Using the corresponding image reconstruction algorithm, the measured capacitance data can be obtained The projection back calculation obtains the medium distribution at the measured section. [0003] Compared with other process tomog...

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Problems solved by technology

Utility model application CN204536251U discloses a thermal circulating fluidized bed boiler bed material fluidization uniformity monitoring system, wherein the capacitance array sensor adopted consists of an outer shield, a measurement electrode array, a high-temperature insulation layer, a radial shield However, in this structure, the measuring electrode array is suspended in the periphery of the high-temperature insulating layer. On the one hand, it is difficult to fix the measuring electrode array; temperature is lower than the outer surface temperature of the boiler, so the sensor provided in this application does not really work in the high temperature environment of the circulating fluidized bed boiler, and at the same time, this arrangement also makes the capacitance value measured by the sensor actually be that of the heat insulation layer, boiler wall, The series value of the capacitance value of the three materials in the furnace increases the difficulty of directly monitoring the fluidization uniformity of the furnace bed material

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